Among the later monographs published by the Field Columbian Museum, Chicago, is a paper in the Geological Series (No. 3) on _The Ores of Colombia, from Mines in Operation in 1892_, by _H. W. Nichols_. It describes the collection prepared for the Columbian Exposition by F. Pereira Gamba and afterward given to the museum--a collection which merits attention for the light it throws upon the nature and mode of occurrence of the ores of one of the most important gold-producing countries of the world, and also because it approaches more nearly than is usual the ideal of what a collection in economic geology should be. Other publications in the museum's Geological Series are _The Mylagauldæ, an Extinct Family of Sciuromorph Rodents_ (No. 4), by _E. S. Riggs_, describing some squirrel-like animals from the Deep River beds, near White Sulphur Springs, Montana; _A Fossil Egg from South Dakota_ (No. 5), by _O. C. Farrington_, relative to the egg of an anatine bird from the early Miocene; and _Contributions to the Paleontology of the Upper Cretaceous Series_ (No. 6), by _W. N. Logan_, in which seven species of _Scaphites_, _Ostrea_, _Gasteropoda_, and corals are described. In the Zoölogical Series, _Preliminary Descriptions of New Rodents from the Olympic Mountains_ (of Washington) (No. 11), by _D. G. Elliot_, relates to six species; _Notes on a Collection of Cold-blooded Vertebrates from the Olympic Mountains_ (No. 12), by _S. E. Meek_, to six trout and three other fish, four amphibia, and three reptiles; and a _Catalogue of Mammals from the Olympic Mountains, Washington_, with descriptions of new species (No. 13), by _D. G. Elliot_, includes a number of species of rodents, lynx, bear, and deer. _Some Notes on Chemical Jurisprudence_ is the title given by _Harwood Huntington_ (260 West Broadway, New York; 25 cents) to a brief digest of patent-law cases involving chemistry. The notes are designed to be of use to chemists intending to take out patents by presenting some of the difficulties attendant upon drawing up a patent strong enough to stand a lawsuit, and by explaining some points of law bearing on the subject. In most, if not all, cases where the chemist has devised a new method or application it is best, the author holds, to take out a patent for self-protection, else the inventor may find his device stolen from him and patented against him.